I have the unique chance of getting some UK exclusive BABs through a co-worker of my brother. What are some of the UK exclusive bears? I know the I ♥ London and I ♥ Great Britain bears are exclusive, but do they have different PSIs online?

Currently available UK exclusives (no guarantee that they won't also be available in the US some time):
I <3 GB Bear
I <3 London Bear
Pudsey (this is a "Children in Need" charity bear -- which is a BBC charity)
Blush (Same as Pudsey)

Not just UK - but currently exclusive to 'europe' (and sometimes including japan, australia, the middle east and south africa):
Sweet Smiles Bunny (different eyes / nose / paws than the US show-based version)
Fuzzy Teddy (No guarantees on this one because I've seen some test bears that look a whole lot like it - so it may not be exclusive for long)

The UK doesn't have the 'real' vanilla fudge II bunny - they have the vanilla cream bunny renamed, so that one isn't exclusive except for its name. To see the difference, look at australia or japan.